I installed a set of tall aluminum valve covers to see if there was any difference. There was not. My small alternator was not charging, so I was in a hurry and stayed in third most of the time. I still need to address the 95 kpa knock.
the lt4 had lighter valves too
try the original knock module to see if its better
I couldn't find the knock module. So if anyone has one for 1995 Corvette they can sell me or loan me, I'm all for that. Nonetheless, I had a couple knock sensors I ordered a week or two ago and installed them. That seemed to change some. I am also thinking of changing the knock sensor connectors, since the replacement wires are so much thicker and not 25 years old. I went for a 28 minute drive, mostly in third.
Thanks again
wait
you have dual knock sensors
and a y body
and an lt4 knock module
will that even work? i thought that module was for single sensor
that knock is still crazy. its definitely not real.
I'm not sure what you are getting at. My car was built with dual knock sensors.
All LT1/LT4 Corvettes had dual knock sensors. On the 92-95 they were wired in series and went to a single input on the PCM. On the 96 they were each given a separate input to the PCM.
The knock modules for all the C4 Corvettes were incredibly similar and used nearly identical circuitry (according to one of the engineers), which I can also confirm by looking at one of my spares and then looking at photos of the knock modules from, for example, the MEMCAL-equipped cars. However, when pressed about pinouts, said engineer was not quite as forthcoming with information. So unfortunately as of yet I still do not have accurate information as to exactly what each of the 8 pins actually do.
A95Y, you can try the band-aid fix of adding teflon tape to the threads of the knock sensors to "desensitize" them, but unfortunately without the ability to fine-tune the frequencies the knock module is filtering out, you may be out of luck for getting accurate knock feedback on your OEM setup.
1990 Corvette (Manual)
1994 Corvette (Automatic)
1995 Corvette (Manual)
Member 69427 on the CorvetteForum knows about electronic timing control. He designed some of the systems. He seems very generous with information.
That’s exactly who I was talking about. I provided photos and data and asked for a pinout of the older knock module since he admitted to having documentation of it, and afterwards he went silent. It seems he’s willing to discuss the theory behind its operation but is mum about certain specific details.
I would love to be proven wrong, though!
1990 Corvette (Manual)
1994 Corvette (Automatic)
1995 Corvette (Manual)
Last edited by Tom H; 07-08-2020 at 05:19 AM.
1990 Corvette (Manual)
1994 Corvette (Automatic)
1995 Corvette (Manual)
I've run numerous guideplate setups with two different non-aligning roller rockers (one chromoly steel and one stainless bodied) and had all sort of false knock issues ('95 Y-body LT-1).
After switching to the Scorpion shaft mount setup referenced in my signature, and Morel solid roller lifters (only needed due to very high spring load) I can finally drive an hour or two with zero knock events. Had I gone the shaft mount rocker setup from the start I would have had $500 more to spend on other fun stuff. You live and you learn.
FWIW - just speaking from experience. Not everyone has false knock problems with roller rockers. My suspicion is it's more prevalent with aluminum head engines and first-gen ODBII ecu programming (and dual knock sensors).
Last edited by spfautsch; 07-14-2020 at 04:02 AM.
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